#2580B7
Closest named color: Nice Blue (#107AB0). oklch(57.4% 0.118 240.7), rgb(37, 128, 183).
Aa
Black text reads best on this color (4.85:1).
About this color
#2580B7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.118 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.022 away. Black text reads best on it, at 4.85:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.85:1 |
| White text | 4.32:1 |
Values
| HEX | #2580B7 |
| RGB | rgb(37, 128, 183) |
| HSL | hsl(203, 66%, 43%) |
| OKLCH | oklch(57.4% 0.118 240.7) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #2580B7 | 4.32:1 | AA large text | Lc -75.1 | Fine for body text |
| Black text on #2580B7 | 4.85:1 | AA | Lc 34.5 | Non-text elements, placeholder text |
| #2580B7 text on white | 4.32:1 | AA large text | Lc 69.6 | Content text, not long reading |
| #2580B7 text on black | 4.85:1 | AA | Lc -32.1 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A3C6E0
oklch(81% 0.053 240.5)
-
Step 400
400
#6EA8D1
oklch(70.7% 0.085 240.3)
-
Step 500
500
#4491C5
oklch(63.1% 0.109 241.1)
-
Step 600
600 (this color)
#2580B7
oklch(57.4% 0.118 240.7)
-
Step 700
700
#0C6798
oklch(49.1% 0.109 240.5)
-
Step 800
800
#11547C
oklch(42.7% 0.091 241.2)
-
Step 900
900
#184663
oklch(37.7% 0.07 240.2)
-
Step 950
950
#10293A
oklch(27% 0.044 240.8)
#2580B7 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #6681B9 | 0.059 |
| Deuteranopia (no green cones) | #5273B6 | 0.047 |
| Tritanopia (no blue cones) | #008E93 | 0.080 |
| Achromatopsia (no color) | #797979 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2580B7
#2580B7
oklch(57.4% 0.118 240.7)
- #AA6622
#AA6622
oklch(57.4% 0.118 60.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #2580B7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.022
- Steel Blue #4682B4 ΔE 0.025
- Windows Blue #3778BF ΔE 0.029
- Cool Blue #4984B8 ΔE 0.030
- Blue NCS #118AB2 ΔE 0.032
- Water Blue #0E87CC ΔE 0.034
- Flat Blue #3C73A8 ΔE 0.039
- Cerulean #457B9D ΔE 0.043
Use #2580B7 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.